Anybody here ride MTB's?

After gaining nearly 20kg's in the last 12 months I need to get fit so I can fit into my leathers for track days
....
Am going to look at a Trek EX5 2012 that a store has on special tomorrow any feedback or advice before I take the plung?...I used to race MTB's 15 years ago
....It's not too late is it 

Am going to look at a Trek EX5 2012 that a store has on special tomorrow any feedback or advice before I take the plung?...I used to race MTB's 15 years ago

